set terminal png
set output "3d_surface.png"
set xlabel "x"
set ylabel "y"
set zlabel "z"
f(x,y)=10*x**2 + y**3
set isosamples 100
set palette rgbformulae 8,9,7
set view 60,60
splot f(x,y) title "z=10x^2+y^3" with pm3d

